Two switch measures ports (upper and lower limits), used in limited alarm or the ration controlling.
路开关量输出接口，用于限量报警或定量控制。
Cubans will still be able to buy a limited amount at a subsidised rate with their ration books, but these too are to be gradually phased out.
古巴仍然可以根据配额购买数量有限的低价糖，但是这些也将逐渐取消。
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